Continuing on with another registry tweak ... here's a way to control whether users can send read receipt messages from their BlackBerry handhelds. Personally, I hate read receipts and would block them at the transport layer, but if you allow them and just want to prevent them from coming a la BlackBerry here's the way to do it.

Taken from the BES 4.1 SP4 Release Notes:

In BlackBerry Enterprise Server Version 4.1 SP4 (and later), you can control whether users can send...